We are off to a festival this summer with the kids, and will probably do some other summer camping. We have two ready beds for the kids (4.5 and 2yrs) but, the 'cover' layer on the ready bed is flimsy and they obviously won't be warm enough with that alone, so my question is what else? will sleeping bags be too much - worried they would be restrictive within the ready bed? Or should I just do blankets over the RB? Our youngest still uses Gro bags, so could go in this with blanket over if necessary....Anyone got any experience of using ready beds, I should add we HAVE to use the ready beds as the kids are obsessed with using them...